Which of the following discoveries resulted in a Nobel Prize?

  • A
    Genetic engineering
  • B
    $X-$rays induce sex-linked recessive lethal mutations
  • C
    Cytoplasmic inheritance
  • D
    Recombination of linked genes

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The type of genetic mutation that involves the substitution of a purine with a pyrimidine or vice versa (or the replacement of one type of base with another type of base) is known as:

What arises due to errors in $DNA$ replication?

Which phenomenon leads to the variation in $DNA$?

Which base is responsible for spontaneous point mutations?

The defect sickle-cell anaemia is caused by the . . . . . . of glutamic acid by valine at the $6^{th}$ position of the . . . . . . globin chain of the haemoglobin molecule.

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